Investigation on toughness index of high grade steel drill pipe

被引：3
|
作者：
Li F.-P. [1 ,2 ]
Han L.-H. [2 ]
Liu Y.-G. [2 ]
Wang Y. [1 ]
机构：
[1] College of Electromechanical Engineering in China University of Petroleum
[2] CNPC Tubular Goods Research Institute
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2011年 / 35卷 / 05期
关键词：
Failure mode; Fatigue; High grade steel drill pipe; Impact energy; Toughness index;
D O I：
10.3969/j.issn.1673-5005.2011.05.024
中图分类号：
学科分类号：
摘要：
Due to the development and application of ultra-deep well and directional well drilling technologies, high grade steel drill pipes, such as G105 and S135, are used widely. The drill pipe failure incidents occur frequently. The fatigue crack length of high grade steel drill pipe is about 60-80 mm at steady developing stage. The impact energy formula of "leak before break" failure mode was proposed, and stress strength coefficient was introduced for the first time. The results show that the impact energy value increases with the increase of critical crack length, stress strength coefficient square, and steel grade. The impact energy values of high grade steel drill pipe and anti-sulfur drill pipe are not less than 80 J and 110 J respectively to ensure drill pipe under "leak before break" failure mode.
引用
收藏
页码：130 / 133
页数：3
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